A-horizon (Meaning in Hindi) ए-संस्तर
(Definition in Hindi) ऊपरी मृदा या मृदा की सबसे ऊपरी परत जिसमें खनिज लवणों तथा कार्बनिक पदार्थों का सर्वाधिक संचय तथा संकेन्द्रण होता है।
(Definition in English) upper level of a soil which is characterized by a mixture of soil particles and organic matter; it is also the zone or layer of leaching of minerals and organic matter.
संस्तरः
मृदा प्रोफाइल का सबसे ऊपरी भाग जहां से घुल सकने वाले लवण तथा कोलॉइड निक्षालित हो चुके होते है और कार्बनिक पदार्थ अत्यधिक मात्रा में जमा हो जाते है।
1. खनिज मृदा का वह पृष्ठ संस्तर जिसमें कार्बनिक पदार्थ की मात्रा और जैविक सक्रियता अधिकतम हो और/अथवा लौह,एल्युमिनियम ऑक्साइड़ों तथा सिलिकेट मृत्तिकाओं जैसे पदार्थों का अवक्षालन हो।
2. मृदा प्रोफाइल का सबसे ऊपरी भाग जहाँ से घुल सकने वाले लवण तथा कोलॉइड निक्षलित हो चुके होते हैं और कार्बनिक पदार्थ अत्यधिक मात्रा में जमा हो जाते हैं।
Soil profile
If a pit is dug in the soil, at least 1 m deep, various layers, different in colour and composition can be seen. These layers are called horizons. This succession of horizons is called the profile of the soil.
मृदा प्रोफाइल
A very general and simplified soil profile can be described as follows:
a. The plough layer (20 to 30 cm thick): is rich in organic matter and contains many live roots. This layer is subject to land preparation (e.g. ploughing, harrowing etc.) and often has a dark colour (brown to black). b. The deep plough layer: contains much less organic matter and live roots. This layer is hardly affected by normal land preparation activities. The colour is lighter, often grey, and sometimes mottled with yellowish or reddish spots.
c. The subsoil layer: hardly any organic matter or live roots are to be found. This layer is not very important for plant growth as only a few roots will reach it.
d. The parent rock layer: consists of rock, from the degradation of which the soil was formed. This rock is sometimes called parent material.
The depth of the different layers varies widely: some layers may be missing altogether.
मृदा प्रोफाइल
Hindi: विपथन, भूल.
Bengali: আপাত বিচ্যুতি, অপেরণ.
A-Sansthar
